PHP will call this method when the session is ready to be saved and closed. It encodes
the session data from the $_SESSION superglobal to a serialized string and passes this
along with the session ID to this method for storage. The serialization method used
is specified in the session.serialize_handler setting.

Note this method is normally called by PHP after the output buffers have been closed unless explicitly
called by session_write_close()

Parameter-Liste

session_id

The session id.

session_data

The encoded session data. This data is the result of the PHP internally encoding the $_SESSION superglobal to a serialized
string and passing it as this parameter. Please note sessions use an alternative serialization method.